Packet-based multimedia communications systems
This version 4 of H.323 integrates without further modifications Annex G (17/02/2000), and includes Annexes J, K, M1 et M2 approved on 17 November 2000, and Annex L that was approved independently on 1 March 2001

Packet-based multimedia communications systems
This version 5 of H.323 integrates without further modifications Annexes M3 (07/2001), P (01/2003), Q (07/2001) and R (07/2001) that were published separately, and Annex O that was approved independently on 07/2003